Duplex feeder for low-pressure heating boilers



Dec. 16, 1930.

L. P. FLOOD DUPLEX FEEDER FOR LOW PRESSURE HEATING BOILERS Filed June 8, 1928 4 Low Leva\ IO W a-noemtoz LEO P. FLOOD III-steam heatings ystems and other-s'ystems devices. It is, therefore, necessary ?atented Dec, 16, 71930 NIT D S TES LED 1?. FLOOD, or s nNYsinE, comrnnygonnnw YORKQN. Y.,

P TENT 5 OFFICE A oonronetrron on NEW YORK nur'nnx FEEDER m now -rianssunn HEATING BOILERS nipplicationfiled lune 8,1928. Serial no; assgsve.

1 The invention 'relates'in general tdfeed water controlling devices and, more-gparticu- 'larly,' to a "duplex feeder for low' pressure steam heating boilers.- r

using low pressure stea m, the water 'level in the boiler drops'dlie toleaksand other losses;

The water level may also rise at times duefto discharge fromthe radiators or other heate'd sirable from the standpoint of safety andefficiency to provide'means for maintaining the water level in the boiler substantially constant. 7 "1 According to one form of theinventiona so called duplex feeder for low'pres'sure steam boilers is provided, which'ope'rates by "a single float and automatically allows feed water to flow into the boiler when thelevel drops below a predetermined point and allows waterto discharge when the water level rises above apredetermined point. r y

The invention also consists in certain new and original features of constructionand combinations-of-par'ts hereinafter set'forth and claimed. i g

' Although the'novel features which are be lieved to be characteristic of this invention will be particularly pointedout' in the-claims appended hereto, the invention itse,lf,' asto its objects'and advantages,"themode of'its operation and the mannerof'its organization maybe better understood by referring .to the following description taken in connection 7 with the accompanying'drawings forminga partthereof, in which 1 Fig. 1 is a section through a duplex feeder Referring'now to the drawing, the

inerci al embodiment ofzth'e. invention is shown, but such illustration is'prnnarily for purposes of d1sclosure,'1t will/be under-V stood that the structure maybe modifiedin various respects withoutfdepar'turefromthe broad spirit and Cscop j of." the invention as hereinafter defined and claimed. a

V feeder comprises a basal having an annular groove "2 and'a domed cylindrical body 3 having a flange fitting into the "groove; The base 1 and body 3 are providedwith forked projections 4: in which. are disposed nuts and can, ASSIGNOR 'ro NASON MANUFACTURING bolts 5 for clamping'the members together,

to make' a water-tight ointltherebetween A gasket of lead wire (not shown) may be placed "in the groove; 2" under the. flange to aid in making a tight "joint.

Thechamberf-(i formed by in thetop'for fconnection tolthe; top of a Water gage glass '(not shown) 1andf to" a pipe (not shown) leading .tof the steam space ofthe' boiler. 1 The body is provided with a second opening -8 which may be connected to the bottom of the water gage glass. The base 1 is provided'with an intake "openi 9 d d c rs p en ns l a d -1 other opening 11 for connection to a pipe (not shown) leading *to the boiler. below 7 i I the bodyand base is provided with suitableopenings. The 7 body a3' is provided with an {opening 7 thelowe'st' allowablefwater level. The base lis also-providedwith a screw threaded recess 12 towhich may befastened a: suitable PPort for supp ftin the r; f de sired. 1

' The intake openingi'g isscrew' threaded to receive a pipe 13't0 which is connected a' source offeed water under suiiicient pres sure to feed the boil'er. A-valve fitting'l is also threaded in this openingfthis fitting comprising an annnlargvalveseat' 15;and a cylindrical :guide 16 having openings '17 in 'fthe. sidewall; The valve plunger 18 disp'osed in the'j guide is made up offa hollow holder. 19; in whichis placed afw asher' 2Ov made of su'itable material such as leadyhard fibre or the like. V i r The base is provided with asecondfitting- 23 disposed in the opening 'andheld there i drieal guide 27' having openings 28. The.

cylindrical guide has a pair of U-shaped standards 29, each standard having aligned openings in which are disposed suitable pins 30 threaded in the lower openings."

Disposed in the fitting 23 is a valve di material secured thereto, by .a screw 35. Projecting ears 36 are provided on the disc 31 through which the pins 29lpass. .Each pin 29 has a coil spring 37 operating between the upper part ofthe standardand the ear 36 to yieldably hold the valve disc on its seat.

Disposed in the chamber 6 is a ball float 40 having a stem 41 secured thereto. The base 1 is provided with-an upstanding forked fulcrum 42 to which ispivoted, by a pivot 43, a lever. 44. The stem 41 is pivoted to the lever 44 by pivot 45. A transverse member 46 having an enlarged portion 47 with an opening straddling the stem 41 is pivoted to the forked stem'of the valve disc 31 by pivot 48and to the forked stem of valve plunger 18 by pivot 49. The member v46 has an elongated slot disposed between the forked end of the valve plunger 18 to pivotally connectthe member to the plunger and to allow a certain amount of relativelateral movement therebetween.

A link 50 having forked ends is pivoted to member 46 by a pivot 51 and to the lever-'44 byapivot 52.

- The water level'in theehambenfi is the same as the level in the boiler on account of the direct connection of the feeder to the steam space and water space of the boiler. hen the water level in the boiler and feeder is normal, the float 40 is, for example, in

the'p-osition shown in full lines and both intake anddischarge valves are closed, If the water level drops, say to the low level indicated, the float also drops, and thesystem of linkage movesthe member 46 about the pivot 48 opening the intake valve. 18, allowing the boiler to receive feed water until normal water level is obtained at which time the valve 18, closes. r V,

If the-water. level risesfsay, to the high level indicated, the additional upward pressure exertedon the float. causes the member 46 to pivot .now about the pivot 49, raising the discharge valve 31 against the springs 87 allowing water to discharge to. reduce the level to normal at which time the valve closes.

.Thus it willbe seen that the springs 37 normally hold the valve 31 closed and, when the water levelis normal the springs are strong enough to allowlthe intake valve 18 to seat with enough pressure to prevent influx of be inaderelatively inexpensively. so 31 having a flat washer 34 made of suitable the feed water under pressure. WVhen the float rises above normal, enough additional pressure is impressed on the float to overcome the tension ofthe springs 37 to open the discharge valve 31.

Thus a duplex feeder for low pressure steam boilers is provided which takes care of too high a level and too 10w a level by asingle ball float. The arrangement consequenuy occupies but small space and'may At the same time the device is very reliable in operation and should have long life and require but small upkeep. The parts are few, they may be made rugged and the arrangement is such that there is nothing to g'etout of order.

' l/Vhilecertain novel features of the invention have, been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in thew-forms and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

s lVhat is claimed is:

1. -A duplex feeder for low pressure heating boilers comprising a chamber adapted to have a certain water level therein corresponding to the water level in the boiler, the floor of said chamber having an outlet opening, a fulcrum in said casing, the floor of said casing having an inlet opening between said outlet opening and fulcrum, a float having a stem betweensaid inlet opening and fulcrum, a lever pivoted between its ends to said fulcrum and at one end tosaid stem, said openings having valve guides, valves in said guides, a

member pivoted to said valves, a'link connectlng the free end ofsaid lever and ad acent end of said member, and sprlng means nor- -mally holding the valve for said outlet opena lever pivoted between its ends to said fulcrum and at one end to said stem, said valve seats having upstanding guides, valveslongitudinally slidable in said guides, a transverse member pivoted to said valves, a link connecting the free end of said lever and adjacent end of said member, said outlet valve guide having an abutment and a coil spring between said abutment and joutletflvalve to normally hold said outlet valve against its seat.

3. An article of the class described com prising a chamber, a single float for controlling the level of liquid in said'chamber, said chamber having inlet and outlet openings, in-

let and outlet valves for said openings, a member pivoted to said valves, connectionbetween said float and member, and means whereby each valve acts as a fulcrum for said mem ber to open the other valve. v

4. In combination, a first valve, a second valve, a lever pivoted to said valves, an actuating member responsive to change in water level, and meansoperated by said actuatmg member whereby said lever may open each valve using the other valve as a fulcrum, and

additional elastic means for holding one of said valves closed, said actuating member holding said other valveclosed at normal water level.

5. Inapparatus of the class described, a

chamber having an outlet opening and a fulcrum, said chamber having an inlet opening between sald outlet openlng and fulcrum, an

operating member responsive :to change in liquid level in said chamber, a first lever pivoted between its ends to said fulcrum and at one end to said operating member, inlet and outlet valves for said inlet-and outlet openings respectively, a simple, transverse, second lever pivoted to said valves, a link connecting the other end of said first lever and adjacent end of said second lever, and 'givable means normally holding said outlet valve closed.

chamber having inlet and outlet openings," an operating member responsive to change in liquid level in said chamber, inlet and outlet valves for said inlet and outlet openings re-,

spectively, a lever pivoted to saidvalves, connection between said lever and said operating member, and means whereby eachvalve acts as the fulcrum forsaid first-lever to open the r other valve.

7. In apparatus of the class described, a chamber having an outlet'openingand a ful-.

i crum, said chamber having an inlet opening 7 my hand;

between said outlet opening and fulcrum, an I operating member responsive to change in liquidlevel in said chamber, inlet and outletm valves for said inlet and outlet openings re spectively, a first lever pivoted to said valves,

a second lever pivoted to said operating mem-i t ber, a llnk connecting said levers, andmeans.

whereby each valve acts as the fulcrum for said first lever to open the other valve.

I r V In testimony. whereof I have hereunto set LEO P, FLOOD. j

6. In apparatus of the class described, a 

